Drag line extensible boom



' Dec. 28, 1954 H. c. HUGHES DRAG LINE EXTENSIBLE BOOM Filed May 4. 1953 Hwy/22s fiecbf INVENTOR WW W Z w m United States PatentfO DRAG LINE EXTENSIBLE BOOM Henry'C. Hughes deceased, lateof Tulsa, kla., by- Lillie VJ Hughes, administratrix,.- Tulsa, Okla.

Application May 4, 1953, SerialNo. 352,832

3'Claims. (Cl."212 -'-144) The invention relates to extensible booms, particularly adapted for excavating where a drag bucket is moved inwardly and outwardly for dragging dirt into a trench or the like, particularly along a right of way, where it IS necessary to utilize a relatively long boom.

A further object is to provide an extensible boom comprising inner and outer telescopically engaged members, and to provide cable supporting means for the boom, and extending over a plurality of sheaves on the upper side of the boom as a whole for bracing the relatively long boom when extended.

A further object is to provide the inner end of the outer boom section with a lug extending downwardly through an elongated slot in the under side of the inner boom section, and cable means connected to said lug and extending over a sheave carried by the outer end of the inner boom section and leading to a boom extending winch.

A further object is to provide a slide block Within the outer boom section and extending upwardly through a longitudinal slot in the outer boom section, and around which slide block sheave one of the loops of the boom supporting cable extends. The slide block assumes a position in engagement with the outer end of the inner boom section at all times for supporting purposes.

A further object is to support the boom by a single cable having one of its ends anchored to the outer end of the outer boom sectign, and extending over multiple sheaves and over the sheaves on the boom and leading to a boom supporting winch.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure l is a view in side elevation of the extensible boom showing the same supported on a conventional form of tractor.

Figure 2 is a top plan view of the boom showing the same in extended position.

Figure 3 is a vertical transverse sectional view taken on line 33 of Figure 1.

Figure 4 is a vertical transverse sectional view taken on line 44 of Figure 1.

Figure 5 is a detail perspective view of the slide block and a portion of the extension beam.

Figure 6 is a bottom perspective of the inner end of the extension boom section, showing a portion of the inner boom section.

Figure 7 is a detail top plan view of the multiple sheaves over which the boom supporting cables extend.

Referring to the drawing, the numeral 1 designates an end viewof a conventional form of tractor, and 2 a supporting bracket extending upwardly from the tractor and in which is mounted a support 3 for the boom, and the multiple sheave block 4. Mounted on the upper side of the tractor is boom supporting and adjusting winch 5.

The inner boom section 6 is preferably tubular and rectangular in cross section, and has its inner end hingedly connected at 7 to the support 3. The inner end of the outer boom section 8 is slidably mounted in the inner boom section 6, and is preferably rectangular in cross section as shown in Figure 6. Extending downwardly 2,698,096 Patented Dec. 28,. 1954 front the 'inner, :end' of the: boom": section '8 is :at lug; :9, which; lug extends through the-elongated: slot r10. id the under SidG'g-Ofi thednneriboomasection 6.. Connectedgto theralug-9 is-an-aextension -cable1h, whiohwable extends outwardly :and: over. a fixed :sheave 12, and thence wear? wardlyowards the tractor :and over a boom extending winch 13..

By operating thewiuch 13 the outer boom section 8; can be extended as desired. The.: extension ioperation preferablytakesplace whennthe outer endof the boom is. restingonzthe ground.

Mounted '-n 1-the tractor 1,-is. a. draguout winch-14 which controls3 a cableal-i, Cable -1 5. extendswoutwardty and over a sheave 16 carried by the outer end of the extension boom 8, and then extends downwardly and connected to a conventional form of drag bucket 17. By manipulating the winch 14, the bucket can be moved outwardly to the full line position shown in Figure 1, after the bucket has previously been pulled inwardly by the drag in cable 18, which cable is controlled by the drag in winch 19 on the tractor. Various positions assumed by the bucket are shown in dotted lines in Figure 1, as well as the inner and outer positions of the extension boom 8.

In relatively long extension booms, it is necessary to provide means for supporting and bracing the boom at a plurality of points along its length, and at the same time provide a movable or travelling support substantially intermediate its length to get a maximum extension and a minimum retraction. To accomplish this result the upper side of the inner boom section 6 is provided with a sheave 20 intermediate its ends, and the outer boom section is provided with a sheave 21 intermediate its ends.

Slidably mounted within the outer boom section 8 is a slide block 22, a portion of which block extends through an elongated slot 23 in the upper side of the outer boom section 8, and is provided with a sheave 24 above the boom sections. Block 23 is disposed between blocks 20 and 21, and being a travelling type, no matter how far the outer boom section is extended by the cable 11, it will be stopped in its inner position by engagement with the outer end 6a of the inner boom section when the slack is taken up on the supporting cable 25. The supporting cable 25 is controlled by the winch 5 and extends upwardly from the winch over a guide sheave 26, and thence over the multiple sheave block 4, and is looped over the various sheaves 20, 24 and 21, and has its other end anchored at 27 to the outer end of the boom, therefore it will be seen that the boom is supported at a multiplicity of points along its entire length by the single cable 25. It will be seen, by providing the travelling sheave 24, no matter how far inwardly or outwardly the boom is extended, the sheave block 22 will engage the outer end of the inner boom section when the slack is taken up in the cable 25.

The device is particularly adapted for filling trenches along narrow right of ways, where the excavated dirt is piled on the outer side of a trench, and where it is not possible for filling machinery to operate to the outside of the trench.

The invention having been set forth what is claimed as new and useful is:

1. An extensible boom for excavating machines, said boom comprising inner and outer telescopically arranged sections, the inner end of the inner boom section being hingedly mounted, a support extending upwardly from the inner end of the inner boom section, a boom supporting winch adjacent the support, a multiple sheave block carried by the support, a plurality of spaced supporting sheaves carried by the upper sides of the boom sections, a supporting cable above the boom, one end of said cable being anchored to the outer end of the outer boom section, said cable extending over the multiple sheaves of the support and over the boom sheaves, the other end of the supporting cable being connected to the boom supporting winch, the inner end of the outer boom section having a lug on its underside, the inner boom section having an elongated slot in its underside, said lug extending through said slot, a sheave carried by the outer end of the inner boom section and a cable connected to the lug and extending over said last named sheave and means for imparting a pull on said cable for extending the boom sections.

2. A device as set forth in claim 1 including, a travelling block slidably mounted Within the outer boom section, the upper side of said outer boom section having an elongated slot, said block having a portion extending through the slot a sheave carried by said portion of the slide block and disposed above the outer boom section, said supporting cable having one of its loops extending over said last named sheave and forming means whereby said block will be maintained in engagement with the outer end of the inner boom section at all times no matter how far the outer boom section is extended.

3. A device as set forth in claim 1 wherein the sheaves carried by the upper side of the boom comprise a sheave spaced from the inner and outer ends of the inner boom 4 section, a sheave carried by the outer boom section and spaced from its inner and outer end and a sheave slidably mounted on the outer boom section and adapted to engage the outer end of the inner boom section at all extended positions of the extensible boom.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,345,304 Zied June 29, 1920 1,636,136 Kernes July 19, 1927 1,751,794 Crandall Mar. 25, 1930 2,545,047 Russell Mar. 13, 1951 2,571,858 Garland Oct. 16, 1951 2,649,189 Schmidt Aug. 18, 1953 

